Sheet filter



s. H. SEITZ SHEET FILTER v. "a M Origifial File'd Nov. 14, 1956 2Sheets-Sheet 1 INVENTORY. I v

QEOEG I Mug/(M62772 ATTORNEYS Reissued Ma 30, 1939 PATENT, OFFICEsum-2'1 FILTER Georg Heinrich Seitz, Bad Kreuznach, Rhineland, Germany,assignor to Seitz-Werke, G. In. b. 11., Bad Kreuznach, Rhineland,Germany Original No. 2,076,049, dated April 6, 1937, Serial No. 110,801,November 14, 1936.

Application for reissue July 22, 1937, Serial No. 155,147. In GermanyMarch 22, 1932 3 Claims. (Cl. 210-488) This invention relates to filtersand relates more particularly to filter presses comprising a largenumber of angular frames clamping thin filter sheets situated betweenthese frames, the liquid to be filtered being supplied to the filtersheets through a channel formed by the assembly of the filter frames andbeing removed from the filter sheets through another channel formed bythe said assembly.

The present application is a continuation-inpart of my co-pending patentapplication relating to Filter presses, filed. July 20, 1935, SerialNumber 32,413.

An object of the present invention isthe provision of a simple andefficiently operable filter, the filter sheets of which are alwaysmaintained in their proper relative positions.

The above and other objects of the present invention may be realized byproviding a filter which comprises a plurality of filter framesinterposed between the frames, means for clamping the assembled framesand sheets, and a support for the filter sheets, which support may beattached to the filter frames, to the main frame supporting the entireassembly or to the drip pan situated underneath the filter frames andthe filter sheets. This support is used for maintaining the filtersheets in their proper positions relatively to the filter frames beforethe frames are pressed against each other to clamp the filter sheets.

The invention will appear more clearly from the following detaileddescription when taken in connection with the accompanying drawingsshowing, by way of example, preferred embodiments of the inventive idea.

In the drawings:

Figure 1 is a perspective view of a filter having supporting meansconnected to its main frame.

Figure 2 is a cross-section through the filter shown in Figure 1.

Figure 3 is a longitudinal vertical section, through the filter shown inFigure 1, and partly. a side elevation.

Figure 4 is a'detail cross-section through a filter the supporting meansof which are con nested in the drip pan.

the drawings, comprises a main frame 8 which is provided with horizontalbars 9 preferably supported upon wheels In. Two vertical bars I Isupport an end frame I2 which is integral with the bars ll. A second endframe l3 carries rollers l4, one of which is shown in Figure 1, and issupported upon horizontal rails or bars which are carried by thevertical bars II and Hi.

The device comprises-a large number of filter frames l1 which areclamped between the end frames l2 and I3 when the filter is beingoperated. Each filter frame 11 is provided with a pair of lateraltriangular projections l8 having curved lower surfaces which fit overthe surfaces of the round bars [5. Due to this arrangement the filterframes H are suspended upon the bars l5 and may be shifted along thesebars.

The clamping means used for clamping the filter frames .11 comprise aboss I9 connected by the web 20 with thervertical supports IS. The innersurfaces of the boss [9 are theaded and mesh with the screw threads of alead rod 2 I one end of which carries a hand wheel 22. The opposite endof the lead rod 2| isrotatably held within a socket 23 constituting anintegral part of the end frame l3.

A drip pan 24 is situated underneath the filter frames l1 and is carriedby two bars 25 which extend between the vertical bars H and I6 and arefirmly connected therewith.

Filter sheets 26 are interposed between the filter frames l1, and arefirmly clamped between these frames when the filter is being operated.As shown in Figure 2, each filter sheet 28 consists of a thin squarepiece made of a filter material.

' The filter sheets 26 are supported by two parallel horizontal bars 21the adjacent ends of which are suspended from a cross-plate 28situatedbetween the two vertical bars l6 and firmly connected therewith. Theopposite ends of the bars 21 are connected to the end frame l2. The'bars21 extend directly underneath the filter frames l1 and serve as a gaugeand support for each filter sheet 26 when it is inserted between twoadjacent filter frames I1, its lower edge resting upon the bars 21.

When the filter is not being used, the end frame it is situated at suchdistance from the end frame 12, that the filter frames I! may be movedfreely upon the bars iii. A separate filter sheet 25 is situated in eachspace between two adjacent filter frames l1 and is carried by the bars2'1. In order to clamp the filter sheets 26, the operator rotates thehand wheel 22 thereby moving the end that the turpid liquid to befiltered is supplied to the interiors of alternate frames and that theclear filtered liquid is removed from the interiors of the remaining i.e.,other alternate frames. As indicated in Figure}, the filter frames Hare arranged in such manner that two cylindrical projections 29 of twofilter frames fit over an edge of an intermediate filter frame thecylindrical projection of which is situated at the opposite side of thefilter.

, Due to the provision of the bars 21, each of the filter sheets 26 ismaintained in its proper position relatively to the filter framese ll atall stages of preparatory and final assembly, After the completion ofthe filtering operation and the withdrawal of the end frame IS, thefilter sheets 26 are again supported by the bars 21 and may be scrapedor cleaned while they are in that position.

'The filter shown in Figures 4 and 5 of the drawings comprises an endframe l2 carried by a vertical bar II and filter frames I! carried bya-bar I! connected to the main frame of the filter. A drip pan 24 issituated underneath the filter frames l1 and is carried by a bar 25connected to the vertical bar ll. Filter sheets 26 which are interposedbetween the filter frames H are carried by a bar or support SI theangular end brackets SI of which are firmly connected to the oppositeside walls of the drip pan 24. v

The filter shown in Figures 6 and 7 comprises filter frames 32 carryingsheets of wiring 33 and supported by projections l8 upon the bars of themain frame. Each of the filter frames 32 carries two horizontal lugs 34which are firmly connected or integral with the filter frame. The lugs34 supportthe filter sheets 26 which are interposed between the filterframes 32.

The lugs may project beyond both of the vertical surfaces of each framein view of the common usage of reversing the filter frames and may belocated at different distances from thelateral edges of thefilter'frames.

While filter sheets of square contour possess definite advantages, suchas the possibility of using simple supporting means and of reversingWhat is claimed is: Y g

1. A filter, comprising in combination a plurality of vertical filterframes situated sideby side, each filter frame comprising twoprojections situated on opposite sides of the frame and at least twosleeves, a plurality of self-sustaining cardboard-like filter sheets,each filter sheet being situated between two adjacent filter frames, amain frame having at least two bars extend- .ing transversely to saidfilter frames on opposite sides thereof, and means situated at thebottom of said filter frames and contacting the bottom I sleeves, aplurality of filter sheets, each filter sheet being, situated betweentwo adjacent filter frames, 9. mainframe having at least two barsextending transversley to said filter frames on. opposite sides thereof,and a rod extending directly underneath and transversely to said filterframes, said rod supporting the filter sheets interposed between thefilter frames; said projecw tions-being slidablyv mounted upon saidbars, whereby said filter frames are carried by said bars, said sleevesbeing adaptedtto contact each other to form passages for the circulatingliquid,

and means for pressing the filter frames one against the other, wherebythe filter sheets are clamped by the filter frames. 1

'3. A filter, comprising in combination a pinrality of filter framessituated side by side, each filter frame comprising two projectionssituated on opposite sides of the frame and at least two sleeves, aplurality of filter sheets, each filter sheet being situated between twoadjacent filter frames, a main frame having at least two bars extendingtransversely to said filter frames on opposite sides and a. supportextending underneath said filter frames and carrying said filter sheets;said projections being slidably mounted upon said bars, whereby saidfilter frames are carried by said bars. said sleeves being adapted tocontact each other to form passages for the circulating liquid, andmeansfor pressing the filter frames one against the other, whereby thefilter sheets are clamped by the filter frames.

emons HCH. sarrz.

